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Shell Programming and Scripting

Print two lines to one

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# 1  
Old 03-17-2010
Print two lines to one
hi input file

Code:
string string
2
string string
3

how to print two lines (line and line bellow) to one line

I know there is command, and works fine
Code:
awk '{printf $0 ";"; getline; print $0}' $FILE

but I am experimenting with awk and tried this solutions, neither one works, could anybody explain why ? or how to modify script to work ? thanks

Code:
#1st

{
   if ($2 != null) {var="$0";}
   else {print $var $1;}
}


#2nd
BEGIN {regex="[0-9].*"}
{
   if ($1 !~ $regex) {var="$0";}
   else {print $var $1;}

}


#3rd
BEGIN {regex="[0-9].*"}
{
   if ($1 !~ $regex) {var="$0";}
   if ($1 ~ $regex) {print $var $1;}

}
getline

# 2  
Old 03-17-2010
Code:
awk 'ORS=(FNR%2)?FS:RS' myFile

# 3  
Old 03-17-2010
vgersh99: Interesting solution Smilie I know there are many but what is wrong about first ? Logicaly is correct to me
# 4  
Old 03-17-2010
Quote:
Originally Posted by wakatana
vgersh99: Interesting solution Smilie I know there are many but what is wrong about first ? Logicaly is correct to me
logically it might be right (depends on what is considered 'logical' of course, but in reality it's not correct.

In general, awk != perl

Now in detail:
Code:
{
   if ($2 != null) {var="$0";}
   else {print $var $1;}
}

  1. what is null? awk assumes a name of a variable. if so where is it defined?
  2. var="$0" - assigns a variable 'var' a value of a STRING "$0" - I bet not what you've wanted.
  3. print $var $1 - print a field NUMBER specified in a variable 'var' followed by the FIRST field.
# 5  
Old 03-17-2010
Shouldn't it be: -

Code:
awk 'ORS=(FNR%2)?FS:RS' FS=";" myfile

To get the desired output: -

Code:
string string;2
string string;3

# 6  
Old 03-17-2010
Quote:
Originally Posted by steadyonabix
Shouldn't it be: -

Code:
awk 'ORS=(FNR%2)?FS:RS' FS=";" myfile

To get the desired output: -

Code:
string string;2
string string;3

OP didn't specify this as a desired output.

Edit: actually you're right, but it was not explicitly specified - good catch!
# 7  
Old 03-17-2010
The desired op can be obtained by running: -

Code:
awk '{printf $0 ";"; getline; print $0}' $FILE
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